VSX2 and microphthalmia: The phenotypic analysis of or mutants, as well as the examination of human patients with hereditary microphthalmia, revealed an essential role for Vsx2 in neuro-epithelial proliferation and bipolar cells differentiation (BarYosef et al., 2004; Burmeister et al., 1996; Ferda Percin et al., 2000).